Abstract: Abstract：The dynamical characteristics of tether tugging deorbiting system after the capture by net or gripper are focused on. The modeling and simulation about a simplified configuration in the presence of offset are studied. The combination after capture consists of space tug, tether and space debris. A simplified configuration is proposed, whose attachment point of tether on space debris is viewed as a fixed offset. Then, taking the descending process as an example, the energy equation is given and the dynamic equations of the system are formulated based on EulerLagrange method. The equilibrium point is obtained under proper assumption that the tether is tight. At last, the dynamical characteristics of the system are analyzed with different initial angular velocities when tether is tight or slack. The results demonstrate that a safe deorbiting can be guaranteed when the initial angular velocity of the object satellite is small, and when the initial tether is either tight or slightly slack.

Key words: Keywords：tether tugging, offset, safe deorbiting